Device for indicating angular position

Details Device for indicating angular position Device for indicating angular position

1990-05-22

1991-02-26

Cuchlinski, Jr., William A.

Geometrical instruments

Gauge

Angle

33 1N, 33391, 33399, 250237G, 356374, G01B 356, G01B 1114, G01C 912

Patent

active

049951696

ABSTRACT:
Device for indicating the angular position between a first part and a part which is rotatable relative to the first part. Each of these parts exhibits a grating (15, 16) consisting of a pattern which, in each grating, comprises opaque lines separated by interspaces, the gratings together being arranged to provide an easily readable moire pattern which indicates whether the opaque lines in the one grating are at a certain position relative to the opaque lines of the other grating. The interspaces of each grating (15, 16) exhibit mutually differing widths, with a width which gradually increases over the height of the one grating (15) in a direction transverse to the longitudinal direction of the interspaces and a width which gradually decreases over the height of the other grating (16) transverse to the longitudinal direction of the interspaces and in the same direction.

REFERENCES:
patent: 3166624 (1965-01-01), Vargady
patent: 3945129 (1976-03-01), Bergkvist
patent: 4288056 (1981-09-01), Bergstrom
patent: 4336659 (1982-06-01), Bergkvist
patent: 4343090 (1982-08-01), Bergkvist

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